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Last change
on this file since 571e0df was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago |
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initial commit
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100644
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File size:
314 bytes
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| 1 | 'use strict';
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| 2 |
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| 3 | module.exports = {
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| 4 | isString: function(arg) {
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| 5 | return typeof(arg) === 'string';
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| 6 | },
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| 7 | isObject: function(arg) {
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| 8 | return typeof(arg) === 'object' && arg !== null;
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| 9 | },
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| 10 | isNull: function(arg) {
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| 11 | return arg === null;
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| 12 | },
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| 13 | isNullOrUndefined: function(arg) {
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| 14 | return arg == null;
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| 15 | }
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| 16 | };
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